Team of security researchers. Features news, original papers and advisories, presentations they have given, and tools they have written.

Hacking related group.

A collection of current hacker news articles.

Offers details regarding select viruses, overflow and security exploits, bios tools, and crytography. Also features book reviews on assembly programming and computer security.

SoCal's hacking group. Canadian free since 1999.

Security advice and exploits.

A New York hacker group.

Offers tutorials and articles on security related content, hacking, cracking, and network exploits.

Exploit archive, phreaking information, and group member pages.

Attrition is an eclectic collection of internet and computer security resources.

Security research site with quality papers and exploits

CyberWarrior specializes in tutorials, downloads ,and other information.

Belgian group specialized in computer and network (in)security, hacking, coding and phreaking.

Underground Hacker site with an extensive archive and library.

Anarchy, HAcking, Phreaking files for newbies.

Coding group. Offer hacking tools and vulnerability exploits.

Hacker lab engaged in vulnerabilities research. Security papers, full disclosure advisories and current projects. Also features a FAQ on hacking techniques.

Organization dedicated to the research and demonstration of vulnerabilities in network services and communication security. Offers papers, security tools, exploit code, advisories and a discussion forum.

Offers blog, team background, tools and BackOrifice downloads, and news archive.